Across 5 covered model years from 2006 to 2010, the Yamaha Why motorcycle has supplied wet/running weights ranging from 172 lb (78 kg) and dry weights ranging from 160.9 lb (73 kg), depending on model year.
Yamaha Why weight overview
Its low overall mass should be most noticeable off the throttle: moving it by hand, backing out of a parking space and managing stop-start riding should take less effort than on a heavy road bike.
Very Light Motorcycle
How heavy is the Yamaha Why?
wet weight
Using a model-level wet weight comparison, the Yamaha Why is lighter than about 98% of 197 Yamaha motorcycles with compatible weight data.
Dry vs ready-to-ride weight
Bike + rider total weight
These totals use the model’s representative wet weight. They exclude riding gear, luggage and a passenger.
Yamaha Why weight & related specs
| Model years covered | 2006, 2007, 2008, 2009, 2010 |
|---|---|
| Wet / running weight | 172 lb (78 kg) |
| Dry weight | 160.9 lb (73 kg) |
| Engine displacement | 49 cc to 49.2 cc |
| Torque | 2.6 lb-ft (3.5 Nm) to 2.9 lb-ft (3.9 Nm) |
| Fuel capacity | 1.85 US gal (7 L) to 1.9 US gal (7.2 L) |
| Full-tank fuel weight (estimated) | 11.5 lb (5.2 kg) to 11.8 lb (5.4 kg) |
Weight changes by model year
The 2006 model is used as the baseline where data is available. Only later supplied values that differ are shown below. A year pill does not mean every individual weight field was supplied for that year.
Useful weight calculations
| Torque per 100 lb | 1.5 lb-ft / 100 lb to 1.79 lb-ft / 100 lb |
|---|---|
| Displacement per pound | 0.29 cc / lb to 0.31 cc / lb |
| Weight per 100 cc | 327.1 lb / 100 cc to 349.5 lb / 100 cc |
| Fuel weight as % of bike weight | 6.7% to 7.3% |
| Weight with full tank | 172.4 lb (78.2 kg) to 172.8 lb (78.4 kg) |
What the weight numbers tell you
Yamaha Why weight FAQ
What is the Yamaha Why dry and wet weight?
Across the covered 2006-2010 years, listed wet/running weight is 172 lb (78 kg) and listed dry weight is 160.9 lb (73 kg). Check the year-change section because the exact figure can vary by model year.
Is the Yamaha Why lighter or heavier than other Yamaha motorcycles?
It is comparatively light for this Yamaha category. The model lands near the 2nd percentile for weight in the compatible dataset.
Which Yamaha Why years have different weight specs?
No clear weight change appears in the usable model-year data. Other specifications may still differ by year.
How much does a full tank add to the Yamaha Why?
Based on the supplied 1.85 US gal (7 L) to 1.9 US gal (7.2 L) tank capacity, the gasoline itself weighs about 11.5 lb (5.2 kg) to 11.8 lb (5.4 kg) when full. This helps explain part of the difference between dry and ready-to-ride mass.
What is the combined Yamaha Why and rider weight?
Using the model’s representative wet/running weight and a 180 lb rider, the combined bike-and-rider mass is about 352 lb (159.6 kg) before riding gear, luggage or a passenger.
How heavy is the Yamaha Why after filling the fuel tank?
Using the listed dry weight plus the calculated fuel mass, the estimated weight with a full tank is 172.4 lb (78.2 kg) to 172.8 lb (78.4 kg). That still may not equal official curb weight because dry-weight definitions can exclude other fluids or equipment.
What is the Yamaha Why torque per 100 lb of bike weight?
Where compatible torque and weight figures are available, the model works out to 1.5 lb-ft per 100 lb to 1.79 lb-ft per 100 lb. This gives more context than torque alone because it relates engine twist to the mass it has to move.
How many cc does the Yamaha Why have per pound?
The available figures work out to 0.29 cc per lb to 0.31 cc per lb. This is not a performance rating, but it is a useful way to compare engine size against total motorcycle mass.
How does the Yamaha Why compare with the median Yamaha motorcycle weight?
Compared with the median Yamaha motorcycle weight of 375 lb (170.1 kg), the model is roughly 203 lb (92.1 kg) lighter.
Motorcycle specifications can vary by model year, market, equipment and the exact dry/curb-weight definition. Calculated fuel-weight and ratio figures on this page are estimates derived from the supplied specifications. Confirm critical figures in the owner’s manual or on the official Yamaha Motorsports website.